如果您使用分层视图(视图从其他视图中提取数据)，从mysqldump导入原始输出可能无法工作，因为mysqldump不关心视图的正确顺序。因此，我编写了脚本，重新排序视图，以纠正飞行中的顺序。

它是这样的:

#!/usr/bin/env perl

use List::MoreUtils 'first_index'; #apt package liblist-moreutils-perl
use strict;
use warnings;


my $views_sql;

while (<>) {
    $views_sql .= $_ if $views_sql or index($_, 'Final view structure') != -1;
    print $_ if !$views_sql;
}

my @views_regex_result = ($views_sql =~ /(\-\- Final view structure.+?\n\-\-\n\n.+?\n\n)/msg);
my @views = (join("", @views_regex_result) =~ /\-\- Final view structure for view `(.+?)`/g);
my $new_views_section = "";
while (@views) {
    foreach my $view (@views_regex_result) {
        my $view_body = ($view =~ /\/\*.+?VIEW .+ AS (select .+)\*\/;/g )[0];
        my $found = 0;
        foreach my $view (@views) {
            if ($view_body =~ /(from|join)[ \(]+`$view`/) {
                $found = $view;
                last;
            }
        }
        if (!$found) {
            print $view;
            my $name_of_view_which_was_not_found = ($view =~ /\-\- Final view structure for view `(.+?)`/g)[0];
            my $index = first_index { $_ eq $name_of_view_which_was_not_found } @views;
            if ($index != -1) {
                splice(@views, $index, 1);
                splice(@views_regex_result, $index, 1);
            }
        }
    }
}

用法: mysqldump -u username -v olddatabase -p | ./mysqldump_view_reorder.pl | mysql -u username -p -D newdatabase .pl

这是我写的一个批处理文件，从命令行自动化，但它适用于Windows/MS-DOS。

语法:rename_mysqldb database newdatabase -u [user] -p[password]

:: ***************************************************************************
:: FILE: RENAME_MYSQLDB.BAT
:: ***************************************************************************
:: DESCRIPTION
:: This is a Windows /MS-DOS batch file that automates renaming a MySQL database 
:: by using MySQLDump, MySQLAdmin, and MySQL to perform the required tasks.
:: The MySQL\bin folder needs to be in your environment path or the working directory.
::
:: WARNING: The script will delete the original database, but only if it successfully
:: created the new copy. However, read the disclaimer below before using.
::
:: DISCLAIMER
:: This script is provided without any express or implied warranties whatsoever.
:: The user must assume the risk of using the script.
::
:: You are free to use, modify, and distribute this script without exception.
:: ***************************************************************************

:INITIALIZE
@ECHO OFF
IF [%2]==[] GOTO HELP
IF [%3]==[] (SET RDB_ARGS=--user=root) ELSE (SET RDB_ARGS=%3 %4 %5 %6 %7 %8 %9)
SET RDB_OLDDB=%1
SET RDB_NEWDB=%2
SET RDB_DUMPFILE=%RDB_OLDDB%_dump.sql
GOTO START

:START
SET RDB_STEP=1
ECHO Dumping "%RDB_OLDDB%"...
mysqldump %RDB_ARGS% %RDB_OLDDB% > %RDB_DUMPFILE%
IF %ERRORLEVEL% NEQ 0 GOTO ERROR_ABORT
SET RDB_STEP=2
ECHO Creating database "%RDB_NEWDB%"...
mysqladmin %RDB_ARGS% create %RDB_NEWDB%
IF %ERRORLEVEL% NEQ 0 GOTO ERROR_ABORT
SET RDB_STEP=3
ECHO Loading dump into "%RDB_NEWDB%"...
mysql %RDB_ARGS% %RDB_NEWDB% < %RDB_DUMPFILE%
IF %ERRORLEVEL% NEQ 0 GOTO ERROR_ABORT
SET RDB_STEP=4
ECHO Dropping database "%RDB_OLDDB%"...
mysqladmin %RDB_ARGS% drop %RDB_OLDDB% --force
IF %ERRORLEVEL% NEQ 0 GOTO ERROR_ABORT
SET RDB_STEP=5
ECHO Deleting dump...
DEL %RDB_DUMPFILE%
IF %ERRORLEVEL% NEQ 0 GOTO ERROR_ABORT
ECHO Renamed database "%RDB_OLDDB%" to "%RDB_NEWDB%".
GOTO END

:ERROR_ABORT
IF %RDB_STEP% GEQ 3 mysqladmin %RDB_ARGS% drop %NEWDB% --force
IF %RDB_STEP% GEQ 1 IF EXIST %RDB_DUMPFILE% DEL %RDB_DUMPFILE%
ECHO Unable to rename database "%RDB_OLDDB%" to "%RDB_NEWDB%".
GOTO END

:HELP
ECHO Renames a MySQL database.
ECHO Usage: %0 database new_database [OPTIONS]
ECHO Options: Any valid options shared by MySQL, MySQLAdmin and MySQLDump.
ECHO          --user=root is used if no options are specified.
GOTO END    

:END
SET RDB_OLDDB=
SET RDB_NEWDB=
SET RDB_ARGS=
SET RDB_DUMP=
SET RDB_STEP=

简单的方法

切换到数据库目录:

cd /var/lib/mysql/

关闭MySQL…这很重要!

/etc/init.d/mysql stop

好吧，这种方法不适用于InnoDB或BDB-Databases。

重命名数据库:

mv old-name new-name

.．.或者桌子……

cd database/

mv old-name.frm new-name.frm

mv old-name.MYD new-name.MYD

mv old-name.MYI new-name.MYI

重新启动MySQL

/etc/init.d/mysql start

做……

好吧，这种方法不适用于InnoDB或BDB数据库。在这种情况下，您必须转储数据库并重新导入它。

有两种方法:

方法1:一个著名的重命名数据库模式的方法是使用Mysqldump转储模式并将其恢复到另一个模式中，然后删除旧的模式(如果需要)。

从壳

 mysqldump emp > emp.out
 mysql -e "CREATE DATABASE employees;"
 mysql employees < emp.out 
 mysql -e "DROP DATABASE emp;"

虽然上面的方法很简单，但它是时间和空间消耗。如果模式大于100GB怎么办?有一些方法可以将上述命令连接在一起以节省空间，但这不会节省时间。

为了纠正这种情况，有另一种重命名模式的快速方法，但是在执行时必须小心。

方法2:MySQL在重命名表方面有一个非常好的特性，甚至可以跨不同的模式工作。这个重命名操作是原子的，在重命名表时没有其他人可以访问它。这只需要很短的时间就可以完成，因为更改表名或表的模式只是元数据的更改。下面是重命名的过程方法:

使用所需的名称创建新的数据库模式。 使用MySQL的" Rename TABLE "命令将旧模式的表重命名为新模式。 删除旧的数据库模式。 如果模式中有视图、触发器、函数、存储过程，也需要重新创建它们。如果表上存在触发器，MySQL的“RENAME TABLE”将失败。为了解决这个问题，我们可以做以下事情:

1)将触发器、事件和存储的例程转储到单独的文件中。在mysqldump命令中使用-E， -R标志(以及转储触发器的-t -d)。一旦触发器被转储，我们将需要从模式中删除它们，以便RENAME TABLE命令能够工作。

 $ mysqldump <old_schema_name> -d -t -R -E > stored_routines_triggers_events.out

2)生成一个只有“BASE”表的列表。可以通过对information_schema的查询找到这些参数。表的表。

 mysql> select TABLE_NAME from information_schema.tables where 
    table_schema='<old_schema_name>' and TABLE_TYPE='BASE TABLE';

3)在输出文件中转储视图。视图可以使用同一个information_schema上的查询来找到。表的表。

mysql> select TABLE_NAME from information_schema.tables where 
   table_schema='<old_schema_name>' and TABLE_TYPE='VIEW';
 $ mysqldump <database> <view1> <view2> … > views.out

4)删除old_schema中当前表上的触发器。

mysql> DROP TRIGGER <trigger_name>;
...

5)在步骤#2中发现的所有“Base”表重命名后恢复上述转储文件。

mysql> RENAME TABLE <old_schema>.table_name TO <new_schema>.table_name;
...
$ mysql <new_schema> < views.out
$ mysql <new_schema> < stored_routines_triggers_events.out

Intricacies with above methods : We may need to update the GRANTS for users such that they match the correct schema_name. These could fixed with a simple UPDATE on mysql.columns_priv, mysql.procs_priv, mysql.tables_priv, mysql.db tables updating the old_schema name to new_schema and calling “Flush privileges;”. Although “method 2″ seems a bit more complicated than the “method 1″, this is totally scriptable. A simple bash script to carry out the above steps in proper sequence, can help you save space and time while renaming database schemas next time.

Percona Remote DBA团队写了一个名为“rename_db”的脚本，其工作方式如下:

[root@dba~]# /tmp/rename_db
rename_db <server> <database> <new_database>

为了演示这个脚本的使用，使用了一个示例模式“emp”，创建测试触发器，在该模式上存储例程。将尝试使用脚本重命名数据库模式，与耗时的转储/还原方法相比，重命名数据库模式需要几秒钟的时间。

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| emp                |
| mysql              |
| performance_schema |
| test               |
+--------------------+


[root@dba ~]# time /tmp/rename_db localhost emp emp_test
create database emp_test DEFAULT CHARACTER SET latin1
drop trigger salary_trigger
rename table emp.__emp_new to emp_test.__emp_new
rename table emp._emp_new to emp_test._emp_new
rename table emp.departments to emp_test.departments
rename table emp.dept to emp_test.dept
rename table emp.dept_emp to emp_test.dept_emp
rename table emp.dept_manager to emp_test.dept_manager
rename table emp.emp to emp_test.emp
rename table emp.employees to emp_test.employees
rename table emp.salaries_temp to emp_test.salaries_temp
rename table emp.titles to emp_test.titles
loading views
loading triggers, routines and events
Dropping database emp

real    0m0.643s
user    0m0.053s
sys     0m0.131s


mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| emp_test           |
| mysql              |
| performance_schema |
| test               |
+--------------------+

正如您在上面的输出中看到的，数据库模式“emp”在不到一秒钟的时间内就被重命名为“emp_test”。最后，这是来自Percona的脚本，上面用于“方法2″”。

#!/bin/bash
# Copyright 2013 Percona LLC and/or its affiliates
set -e
if [ -z "$3" ]; then
    echo "rename_db <server> <database> <new_database>"
    exit 1
fi
db_exists=`mysql -h $1 -e "show databases like '$3'" -sss`
if [ -n "$db_exists" ]; then
    echo "ERROR: New database already exists $3"
    exit 1
fi
TIMESTAMP=`date +%s`
character_set=`mysql -h $1 -e "show create database $2\G" -sss | grep ^Create | awk -F'CHARACTER SET ' '{print $2}' | awk '{print $1}'`
TABLES=`mysql -h $1 -e "select TABLE_NAME from information_schema.tables where table_schema='$2' and TABLE_TYPE='BASE TABLE'" -sss`
STATUS=$?
if [ "$STATUS" != 0 ] || [ -z "$TABLES" ]; then
    echo "Error retrieving tables from $2"
    exit 1
fi
echo "create database $3 DEFAULT CHARACTER SET $character_set"
mysql -h $1 -e "create database $3 DEFAULT CHARACTER SET $character_set"
TRIGGERS=`mysql -h $1 $2 -e "show triggers\G" | grep Trigger: | awk '{print $2}'`
VIEWS=`mysql -h $1 -e "select TABLE_NAME from information_schema.tables where table_schema='$2' and TABLE_TYPE='VIEW'" -sss`
if [ -n "$VIEWS" ]; then
    mysqldump -h $1 $2 $VIEWS > /tmp/${2}_views${TIMESTAMP}.dump
fi
mysqldump -h $1 $2 -d -t -R -E > /tmp/${2}_triggers${TIMESTAMP}.dump
for TRIGGER in $TRIGGERS; do
    echo "drop trigger $TRIGGER"
    mysql -h $1 $2 -e "drop trigger $TRIGGER"
done
for TABLE in $TABLES; do
    echo "rename table $2.$TABLE to $3.$TABLE"
    mysql -h $1 $2 -e "SET FOREIGN_KEY_CHECKS=0; rename table $2.$TABLE to $3.$TABLE"
done
if [ -n "$VIEWS" ]; then
    echo "loading views"
    mysql -h $1 $3 < /tmp/${2}_views${TIMESTAMP}.dump
fi
echo "loading triggers, routines and events"
mysql -h $1 $3 < /tmp/${2}_triggers${TIMESTAMP}.dump
TABLES=`mysql -h $1 -e "select TABLE_NAME from information_schema.tables where table_schema='$2' and TABLE_TYPE='BASE TABLE'" -sss`
if [ -z "$TABLES" ]; then
    echo "Dropping database $2"
    mysql -h $1 $2 -e "drop database $2"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.columns_priv where db='$2'" -sss` -gt 0 ]; then
    COLUMNS_PRIV="    UPDATE mysql.columns_priv set db='$3' WHERE db='$2';"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.procs_priv where db='$2'" -sss` -gt 0 ]; then
    PROCS_PRIV="    UPDATE mysql.procs_priv set db='$3' WHERE db='$2';"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.tables_priv where db='$2'" -sss` -gt 0 ]; then
    TABLES_PRIV="    UPDATE mysql.tables_priv set db='$3' WHERE db='$2';"
fi
if [ `mysql -h $1 -e "select count(*) from mysql.db where db='$2'" -sss` -gt 0 ]; then
    DB_PRIV="    UPDATE mysql.db set db='$3' WHERE db='$2';"
fi
if [ -n "$COLUMNS_PRIV" ] || [ -n "$PROCS_PRIV" ] || [ -n "$TABLES_PRIV" ] || [ -n "$DB_PRIV" ]; then
    echo "IF YOU WANT TO RENAME the GRANTS YOU NEED TO RUN ALL OUTPUT BELOW:"
    if [ -n "$COLUMNS_PRIV" ]; then echo "$COLUMNS_PRIV"; fi
    if [ -n "$PROCS_PRIV" ]; then echo "$PROCS_PRIV"; fi
    if [ -n "$TABLES_PRIV" ]; then echo "$TABLES_PRIV"; fi
    if [ -n "$DB_PRIV" ]; then echo "$DB_PRIV"; fi
    echo "    flush privileges;"
fi

我使用以下方法重命名数据库

使用mysqldump或任何数据库工具备份文件，如heidiSQL,mysql管理员等 在某些文本编辑器中打开备份(例如backupfile.sql)文件。 搜索并替换数据库名称并保存文件。

4.恢复已编辑的sql文件

使用以下几个简单的命令:

mysqldump -u username -p -v olddatabase > olddbdump.sql
mysqladmin -u username -p create newdatabase
mysql -u username -p newdatabase < olddbdump.sql

或者使用@Pablo Marin-Garcia建议的以下方法来减少I/O:

mysqladmin -u username -p create newdatabase
mysqldump -u username -v olddatabase -p | mysql -u username -p -D newdatabase